diff --git a/composer.json b/composer.json
index a857431..a754501 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
     ],
     "minimum-stability": "stable",
     "require-dev": {
-        "phpunit/phpunit": "3.7.*",
+        "phpunit/phpunit": "4.6.*",
         "squizlabs/php_codesniffer": "1.5.*"
     },
     "autoload": {